Forehead mask



FIG. 1 is a perspective view of a forehead mask;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a right view thereof;

FIG. 5 is a left view thereof;

FIG. 6 is a top view thereof;

FIG. 7 is a bottom view thereof;

FIG. 8 is an exploded perspective view thereof;

FIG. 9 is a perspective view thereof, shown in an environment of use; and,

FIG. 10 is a perspective view thereof, shown in another environment of use.

In the drawings, the broken lines represent environmental subject matter and form no part of the claimed design. 

CLAIM The ornamental design for a forehead mask, as shown and described. 